<?php
namespace PHPUtil;

class FtpUtil
{
    //FTP 连接资源
    private $link;
    //FTP连接时间
    public $link_time;
    //错误代码
    private $err_code = 0;
    //传送模式{文本模式:FTP_ASCII, 二进制模式:FTP_BINARY}
    public $mode = FTP_BINARY;

    /**
     * 初始化类
     **/
    public function start($data)
    {
        if (empty($data['port'])) {
            $data['port'] = '21';
        }
        if (empty($data['pasv'])) {
            $data['pasv'] = false;
        }
        if (empty($data['ssl'])) {
            $data['ssl'] = false;
        }
        if (empty($data['timeout'])) {
            $data['timeout'] = 30;
        }

        return $this->connect($data['server'], $data['username'],
            $data['password'], $data['port'], $data['pasv'], $data['ssl'],
            $data['timeout']);
    }

    /**
     * 连接FTP服务器
     * @param string $host 　　 服务器地址
     * @param string $username 　　　用户名
     * @param string $password 　　　密码
     * @param integer $port 　　　　   服务器端口，默认值为21
     * @param boolean $pasv 是否开启被动模式
     * @param boolean $ssl 　　　　 　是否使用SSL连接
     * @param integer $timeout 超时时间　
     */
    public function connect(
        $host,
        $username = '',
        $password = '',
        $port = '21',
        $pasv = false,
        $ssl = false,
        $timeout = 30
    ){
        $start = time();
        if ($ssl) {
            if (!$this->link = @ftp_ssl_connect($host, $port, $timeout)) {
                $this->err_code = 1;

                return false;
            }
        } else {
            if (!$this->link = @ftp_connect($host, $port, $timeout)) {
                $this->err_code = 1;

                return false;
            }
        }

        if (@ftp_login($this->link, $username, $password)) {
            if ($pasv) {
                ftp_pasv($this->link, true);
            }
            $this->link_time = time() - $start;

            return true;
        } else {
            $this->err_code = 1;

            return false;
        }
    }

    /**
     * 创建文件夹
     * @param string $dirname 目录名，
     */
    public function mkdir($dirname)
    {
        if (!$this->link) {
            $this->err_code = 2;

            return false;
        }
        $dirname = $this->ck_dirname($dirname);
        $nowdir = '/';
        foreach ($dirname as $v) {
            if ($v && !$this->chdir($nowdir . $v)) {
                if ($nowdir) {
                    $this->chdir($nowdir);
                }
                @ftp_mkdir($this->link, $v);
            }
            if ($v) {
                $nowdir .= $v . '/';
            }
        }

        return true;
    }

    /**
     * 上传文件
     * @param string $remote 远程存放地址
     * @param string $local 本地存放地址
     */
    public function put($remote, $local)
    {
        if (!$this->link) {
            $this->err_code = 2;

            return false;
        }
        $dirname = pathinfo($remote, PATHINFO_DIRNAME);
        if (!$this->chdir($dirname)) {
            $this->mkdir($dirname);
        }
        if (@ftp_put($this->link, $remote, $local, $this->mode)) {
            return true;
        } else {
            $this->err_code = 7;

            return false;
        }
    }

    /**
     * 下载文件
     * @param string $remote 远程存放地址
     * @param string $local 本地存放地址
     */
    public function get($remote, $local)
    {
        if (!$this->link) {
            $this->err_code = 2;

            return false;
        }
        $dirname = pathinfo($local, PATHINFO_DIRNAME);

        if (!is_dir($dirname)) {
            mkdir($dirname);
        }

        if (@ftp_get($this->link, $local, $remote, $this->mode)) {
            return true;
        } else {
            $this->err_code = 8;

            return false;
        }
    }

    /**
     * 删除文件夹
     * @param string $dirname 目录地址
     * @param boolean $enforce 强制删除
     */
    public function rmdir($dirname, $enforce = false)
    {
        if (!$this->link) {
            $this->err_code = 2;

            return false;
        }
        $list = $this->nlist($dirname);
        if ($list && $enforce) {
            $this->chdir($dirname);
            foreach ($list as $v) {
                $this->delete($v);
            }
        } elseif ($list && !$enforce) {
            $this->err_code = 3;

            return false;
        }
        @ftp_rmdir($this->link, $dirname);

        return true;
    }

    /**
     * 删除指定文件
     * @param string $filename 文件名
     */
    public function delete($filename)
    {
        if (!$this->link) {
            $this->err_code = 2;

            return false;
        }
        if (@ftp_delete($this->link, $filename)) {
            return true;
        } else {
            $this->err_code = 4;

            return false;
        }
    }

    /**
     * 返回给定目录的文件列表
     * @param string $dirname 目录地址
     * @return array 文件列表数据
     */
    public function nlist($dirname)
    {
        if (!$this->link) {
            $this->err_code = 2;

            return false;
        }
        if ($list = @ftp_nlist($this->link, $dirname)) {
            return $list;
        } else {
            $this->err_code = 5;

            return false;
        }
    }

    /**
     * 返回给定目录的文件列表
     * @param string $dirname 目录地址
     * @return array 文件列表数据
     */
    public function rawlist($dirname, $recursive = false)
    {
        if (!$this->link) {
            $this->err_code = 2;

            return false;
        }
        if ($list = @ftp_rawlist($this->link, $dirname, $recursive)) {
            return $list;
        } else {
            $this->err_code = 5;

            return false;
        }
    }

    /**
     * 在 FTP 服务器上改变当前目录
     * @param string $dirname 修改服务器上当前目录
     */
    public function chdir($dirname)
    {
        if (!$this->link) {
            $this->err_code = 2;

            return false;
        }
        if (@ftp_chdir($this->link, $dirname)) {
            return true;
        } else {
            $this->err_code = 6;

            return false;
        }
    }

    /**
     * 获取错误信息
     */
    public function get_error()
    {
        if (!$this->err_code) {
            return false;
        }
        $err_msg = array(
            '1' => 'Server can not connect',
            '2' => 'Not connect to server',
            '3' => 'Can not delete non-empty folder',
            '4' => 'Can not delete file',
            '5' => 'Can not get file list',
            '6' => 'Can not change the current directory on the server',
            '7' => 'Can not upload files',
            '8' => 'Can not download files'
        );

        return $err_msg[$this->err_code];
    }

    /**
     * 检测目录名
     * @param string $url 目录
     * @return 由 / 分开的返回数组
     */
    private function ck_dirname($url)
    {
        $url = str_replace('', '/', $url);
        $urls = explode('/', $url);

        return $urls;
    }

    /**
     * 关闭FTP连接
     */

    public function close()
    {
        return @ftp_close($this->link);
    }
}